Some everyday tricks are so useful and simple they can come in handy to more than one generation. Yet over time, they’re somehow forgotten, and they turn into what’s called "grandma’s tips."GIGGAG decided to recall the past and collected for you eight tricks from childhood, which everyone forgot for some reason.

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To multiply by 9, straighten your fingers, and put your hands on a table with your palms down. Now, to multiply any number by 9, just bend the corresponding finger. Fingers “before“ mean tens, ”after“ — units. For example, to multiply 7 by 9, bend the 7th finger. 6 fingers remain “before” and 3 ”after." We get the answer: 7×9 = 63.